import os
begin=1
end=14
step=3

src_path='C:\\Users\\liuqimin\\Desktop\\高等数学(上册)-第七版-同济大学数学系'
dest_path='d:\\临时图书'
head='1.1'
for i in  range(begin, end+1):
    tt=head+'-'+str(i)+'.png'
    xx=head+'-'+str(i+step)+'.png'
    print(xx)
    if os.path.exists(os.path.join(src_path,tt)):
        os.system('copy '+ os.path.join(src_path,tt) + ' '+ os.path.join(dest_path,xx) )


#-------------------------------------
src_path='C:\\Users\\liuqimin\\Desktop\\高等数学(上册)-第七版-同济大学数学系'
dest_path='d:\\temp'
for f in os.listdir(path):

    if '_' in f :
        continue
    tt=os.path.join(src_path, f)
    xx=os.path.join(dest_path, f)
    os.system('copy ' + tt +' '+xx)